On Fri, Aug 24, 2018 at 11:04 PM, Jani Nikula <jani.nikula@xxxxxxxxx> wrote: > On Wed, 22 Aug 2018, Chris Chiu <chiu@xxxxxxxxxxxx> wrote: >> On Fri, Jul 6, 2018 at 2:44 PM, Chris Chiu <chiu@xxxxxxxxxxxx> wrote: >>> On Thu, Jul 5, 2018 at 10:40 PM, Ville Syrjälä >>> <ville.syrjala@xxxxxxxxxxxxxxx> wrote: >>>> On Thu, Jul 05, 2018 at 03:58:36PM +0800, Chris Chiu wrote: >>>>> Hi, >>>>> We have few ASUS laptops X705FD (The new WiskyLake), X560UD (intel >>>>> i5-8250U), X530UN (intel i7-8550U) share the same problem, which is >>>>> the HDMI connector status stays connected even the HDMI cable has been >>>>> unplugged. Look into the "/sys/class/drm/card0-HDMI-A-1/status" for >>>>> checking the status while plug/unplug the HDMI, it shows >>>>> "disconnected" before plug in HDMI cable, then switch to "connected" >>>>> after plugin, and still stay "connected" after unplug. This would >>>>> cause the audio output path cannot correctly switch from HDMI to >>>>> internal speaker after unplugging the HDMI. >>>>> >>>>> I then try to verify with the latest kernel 4.18.0-rc3+, the bug still >>>>> present. The full "dmesg" log is here. >>>>> https://gist.github.com/mschiu77/d761d7c5cf191b7868d4d7788ae087f1 >>>>> >>>>> The HDMI cable is plugged in at ~26th second. >>>>> "[ 26.214371] [drm:drm_detect_monitor_audio [drm]] Monitor has basic >>>>> audio support" >>>>> then unplug the HDMI at ~73th second. >>>>> "[ 73.328361] [drm:drm_detect_monitor_audio [drm]] Monitor has basic >>>>> audio support" >>>>> >>>>> Please advise what I can do to fix this. Thanks >>>> >>>> Pull the cable out faster? >>>> >>>> I presume this is the same old case of hpd disconnecting slightly >>>> before ddc and we still manage to read the EDID when processing >>>> the hpd irq. We kinda tried to fix that with the live status >>>> check but that thing failed spectacularly. >>>> >>>> -- >>>> Ville Syrjälä >>>> Intel >> >> There's a patch https://bugs.freedesktop.org/show_bug.cgi?id=107125#c8. >> And I verified on the X705FD/X560UD which were easy to reproduce, the patch >> works as expected. Can anyone kindly give comments about this patch? >> We can do anything to help fix this issue upstream. Thanks > > Seems like a hack. Should look into hw based debouncing or a slight > delay in the hotplug work processing I think. > > BR, > Jani. > So you're suggesting to add a slight delay directly in i915_hotplug_work_func()? And any suggestion about the 'hw based' debouncing? Maybe some examples that I can refer to? Thanks >> >> Chris >> >>> Thanks for the suggestion. I tried pulling the cable out faster, the status >>> shows correctly. I also tried branch drm-tip of >>> https://cgit.freedesktop.org/drm/drm-tip >>> but the symptom persists. >>> >>> Anything I can help here? Or any old commit/patch I can try to do some >>> experiments? >>> >>> Chris > > -- > Jani Nikula, Intel Open Source Graphics Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
